Porous Boron Nitride as a Weak Solid Base Catalyst

Shohei Nakamura; Atsushi Takagaki; Motonori Watanabe; Kanta Yamada; Masaaki Yoshida; Tatsumi Ishihara

doi:10.1002/cctc.202001435

Porous Boron Nitride as a Weak Solid Base Catalyst

Shohei Nakamura, Atsushi Takagaki, Motonori Watanabe, Kanta Yamada, Masaaki Yoshida, Tatsumi Ishihara

Advanced Energy Conversion Systems Thrust

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2 Citations (Scopus)

Abstract

Porous boron nitride was synthesized by pyrolysis from boric acid and urea mixed in varying molar ratios. The boron nitride prepared had high surface areas ranging from 376 to 647 m² g⁻¹ with both microporous and mesoporous structures. The sample prepared with a urea-to-boric acid molar ratio of 5 exhibited the highest pore volume with the highest surface area of mesopores. Boron-K edge X-ray absorption fine structure spectroscopy revealed that the surface structure consisted of BN₃ sites along with BN₂O, BNO₂, and BO₃ sites. Fourier transform infrared (FTIR) spectroscopy indicated the formation of amino and hydroxyl groups on the surface. Analysis using color indicator reagents and deuterated chloroform-adsorbed FTIR results indicated that the porous boron nitride had very weak base sites of strength +7.2>H−≥+6.3. Porous boron nitride exhibited a high activity for the nitroaldol reaction with a high selectivity for nitroalkene (>97 %). A good correlation was observed between the catalytic activity of the boron nitride catalysts and their porous structures.

Original language	English
Pages (from-to)	6033-6039
Number of pages	7
Journal	ChemCatChem
Volume	12
Issue number	23
DOIs	https://doi.org/10.1002/cctc.202001435
Publication status	Published - Dec 4 2020

All Science Journal Classification (ASJC) codes

Catalysis
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry

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title = "Porous Boron Nitride as a Weak Solid Base Catalyst",

abstract = "Porous boron nitride was synthesized by pyrolysis from boric acid and urea mixed in varying molar ratios. The boron nitride prepared had high surface areas ranging from 376 to 647 m2 g−1 with both microporous and mesoporous structures. The sample prepared with a urea-to-boric acid molar ratio of 5 exhibited the highest pore volume with the highest surface area of mesopores. Boron-K edge X-ray absorption fine structure spectroscopy revealed that the surface structure consisted of BN3 sites along with BN2O, BNO2, and BO3 sites. Fourier transform infrared (FTIR) spectroscopy indicated the formation of amino and hydroxyl groups on the surface. Analysis using color indicator reagents and deuterated chloroform-adsorbed FTIR results indicated that the porous boron nitride had very weak base sites of strength +7.2>H−≥+6.3. Porous boron nitride exhibited a high activity for the nitroaldol reaction with a high selectivity for nitroalkene (>97 %). A good correlation was observed between the catalytic activity of the boron nitride catalysts and their porous structures.",

author = "Shohei Nakamura and Atsushi Takagaki and Motonori Watanabe and Kanta Yamada and Masaaki Yoshida and Tatsumi Ishihara",

note = "Funding Information: This work was supported by a Grant‐in‐Aid for Science Research (B) (No. 18H01785) of JSPS, Japan. A part of this work was performed at the KEK‐IMSS‐PF (2017G529 and 2019G674). Funding Information: This work was supported by a Grant-in-Aid for Science Research (B) (No. 18H01785) of JSPS, Japan. A part of this work was performed at the KEK-IMSS-PF (2017G529 and 2019G674). Publisher Copyright: {\textcopyright} 2020 Wiley-VCH GmbH",

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AU - Nakamura, Shohei

AU - Takagaki, Atsushi

AU - Watanabe, Motonori

AU - Yamada, Kanta

AU - Yoshida, Masaaki

AU - Ishihara, Tatsumi

N1 - Funding Information: This work was supported by a Grant‐in‐Aid for Science Research (B) (No. 18H01785) of JSPS, Japan. A part of this work was performed at the KEK‐IMSS‐PF (2017G529 and 2019G674). Funding Information: This work was supported by a Grant-in-Aid for Science Research (B) (No. 18H01785) of JSPS, Japan. A part of this work was performed at the KEK-IMSS-PF (2017G529 and 2019G674). Publisher Copyright: © 2020 Wiley-VCH GmbH

PY - 2020/12/4

Y1 - 2020/12/4

N2 - Porous boron nitride was synthesized by pyrolysis from boric acid and urea mixed in varying molar ratios. The boron nitride prepared had high surface areas ranging from 376 to 647 m2 g−1 with both microporous and mesoporous structures. The sample prepared with a urea-to-boric acid molar ratio of 5 exhibited the highest pore volume with the highest surface area of mesopores. Boron-K edge X-ray absorption fine structure spectroscopy revealed that the surface structure consisted of BN3 sites along with BN2O, BNO2, and BO3 sites. Fourier transform infrared (FTIR) spectroscopy indicated the formation of amino and hydroxyl groups on the surface. Analysis using color indicator reagents and deuterated chloroform-adsorbed FTIR results indicated that the porous boron nitride had very weak base sites of strength +7.2>H−≥+6.3. Porous boron nitride exhibited a high activity for the nitroaldol reaction with a high selectivity for nitroalkene (>97 %). A good correlation was observed between the catalytic activity of the boron nitride catalysts and their porous structures.

AB - Porous boron nitride was synthesized by pyrolysis from boric acid and urea mixed in varying molar ratios. The boron nitride prepared had high surface areas ranging from 376 to 647 m2 g−1 with both microporous and mesoporous structures. The sample prepared with a urea-to-boric acid molar ratio of 5 exhibited the highest pore volume with the highest surface area of mesopores. Boron-K edge X-ray absorption fine structure spectroscopy revealed that the surface structure consisted of BN3 sites along with BN2O, BNO2, and BO3 sites. Fourier transform infrared (FTIR) spectroscopy indicated the formation of amino and hydroxyl groups on the surface. Analysis using color indicator reagents and deuterated chloroform-adsorbed FTIR results indicated that the porous boron nitride had very weak base sites of strength +7.2>H−≥+6.3. Porous boron nitride exhibited a high activity for the nitroaldol reaction with a high selectivity for nitroalkene (>97 %). A good correlation was observed between the catalytic activity of the boron nitride catalysts and their porous structures.

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Porous Boron Nitride as a Weak Solid Base Catalyst

Abstract

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